Sebastian J. Gunningham, SVP of seller services, is no longer a "Section 16 officer," according to Rogers. In other words, he's not a member of the company's top management team who must be listed in SEC filings.

It's not clear what Gunningham's role is with the company. We did notice that Gunningham, who joined Amazon in 2007, sold about 80 percent of his Amazon stock in March 2011, right around the four-year anniversary with the company, netting $11 million. Tech companies typically grant stock awards that vest over four-year periods.